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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '032a0b6bcce3a8f0c3121f7d310e66a789b3344557e36d4dda8993d78af850fa' 
  AND token = '5HREVrf5L53MOtlBYldSMX6R9ECaRElemE6CdQHtuCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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