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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2320546d53901f88fa610e01f0a4905156af03bfb9a1f38c042ea5a17ee9286' 
  AND token = '+LOTDzbHVYad8HQ6ljgzj8cT54H2YbZs/6vC1fkC7T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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