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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e296df137b96f3f39f39d67d0e8e2a99bfac4cdef9d226d89da7d653e4c2c2fd' 
  AND token = 'IIvtE6d6Lb7A5a2RRkQKfujcJ/AisAVKQaB5AKWeRiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}