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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac2b7a05cc35a8cdf74d87ee7979bc969ddf679f02fea853042d4239175adda' 
  AND token = 'k1I9KiuHI7m+I3dKDYoTgWSLxmQsaLfiqnaljN7XX10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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