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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ab0a64c91b104a711a0c32e05cf75c08d32b8094bc45e658b8f31ed80d6ee10' 
  AND token = 'BQ2kWgpVCt5lwGsX2eqeBo7rHN9EWZpYED3t4dpPaow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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