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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a694cde41b9a30282ffa646df834f75f8200616a5e9b2a869401d8cf3fefa648' 
  AND token = 'HdH2R1VWTKlu9/Loi2gX6m6/0iRKZ3yDw2Cfxcau8DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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