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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64317b6f5143ccc9100dfb14b9431a0a69fbf45386472a6b39fbc9a762595085' 
  AND token = 'fjPBpLvtkOdollhZz2RFoIdtSI4+lgXaBCT14fdSpQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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