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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '606120ab1ce88e8e7c8b21199d4d138db390dbe500289c9c3f47396b14617535' 
  AND token = 'ucLPIxaMg391qFTfKg4M5YYdqk4hjVXX4UYGWraN7P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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