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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '877a1386b54e32d41456c49511208821831d7f2e201aab12b69663d61c0c25b1' 
  AND token = 'h8zRkcq8ixDNOKnvq+Ku40Rydr+tV5rD6SqHozSFTTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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