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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aaac6d971c80c14fe813cc6eef706608abc54e26b7d7261080f282aceed0e4c' 
  AND token = 'bBxoBYDIxl6J60pq+QZU9jJwC7kgCAgGD6vgLdi8I2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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