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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c68b9a5756a90a32ee92073912b6d2abdc2ed15c0127248277ed6642982bea' 
  AND token = '3sp5qKBe8duC2MrOwUBKzowRtuboN0Q2db07eivNCiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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