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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b76faf57f62aeee5095abba4f92ce71c6cb15915e87c213b93c1b09a0891cb2' 
  AND token = 'eUcUE27JQvE5jEQ96jlznmizH7rNLHl5Gpa2FcxZP9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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