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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4ff11c226ffa2468c308ce7f87b873bc88480b7e3b5eb5ada064fb624e344ea' 
  AND token = 'Y++348jphfvlfnHE/j9wacAc5duUWt8b2Hz4nAD4PqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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