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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd5cb782e3e33c0cdcb2ecc6509fcfa15a05fabf554065f7674c7b5d11e0c39a' 
  AND token = 'q41KWvLrMcPiHjx10Mdb2R3FpGPb+JOQliPnB+Y68oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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