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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd45747572cc108c8e3ba047ed2a126b0c6ca9121d6254babbd8099838ede3f1b' 
  AND token = 'rIZtE1dxrtNox2fdnQr3Sm5pinicO1V3ne9POQv6doE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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