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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2e8d94086bfe88c99e9202a94afef69834cec49ea2262305b25b4a5bbdab09c' 
  AND token = 'vR9ixGwC2hNS4Pvi1tr7GaimfTqAfeUOpLb80wkg/ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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