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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b0fb55f6d5940dfc299e2ede74541730fb65c2688651d6881185dd46c559e88' 
  AND token = 'vuhv4AL1G/5gfqO6cUZb4rjByXFY9tOZO5gMBdWaYk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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