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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98aaa34f1ee622b00b22fa69be03e457a4586503662857a63cfa2997f4c2dde3' 
  AND token = 'TFHL/X/Tx4J55cmdY1CrnobmXRBrrsvNhqea/R79s0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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