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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f452d9f390400793ee38caef989542aa98c38f6f15662da1f9d8a362044ba8e' 
  AND token = 'JjYn+TGWfVBcRPJed0Dvc4br6jMEOdnV8gFlUKePlLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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