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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0420a95b330f3e9f811b8dcf22964618393cc602f095c6427fe37c0428f0300' 
  AND token = 'M36eSEWaCWL2sWiFWz4hC4kAQeu55eojsVRZLQ7DM2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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