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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abf2b3f27fc138c0c771b6b27503420c20b14b682ccfce247b66fab31664b862' 
  AND token = 'zcJ1CkOJIrHEkAzQ2ZhnbAU3dfoe85SwMZDu1gW63Zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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