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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b495182fd3e79c6e2360d4622e7c954ab77dcf63ef3eca77e04165c2f1d4c114' 
  AND token = 'SCE0gDcYXpSO11At19xmmRqvbHvCetea3hhGvKBcumA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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