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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2975dc7da2df2e1c1fdc7ce51c32c6e4edad8b20a5a9ef763e887915d85b4fe1' 
  AND token = 'g8nC2jKO43EfC0j3R/EygxPwwgJmjxvpGmFF5FcOzKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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