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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05d14699a4e5e2bba856fc158d14e8ad94874b43445d60d721e69cf97e3a556d' 
  AND token = '7xQJS2GmPF11Fro1zEcacXleXiSpfuabRXBHI2zb18U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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