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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e2fb5cc2c28b2088426327683153d0fa80605f8af39109ad322bbf30d99fe1e' 
  AND token = 'FegjEmYfxPNEt7Ky3XHeX+jtPUmyIzGpin7xLF1XDco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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