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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e89a022543439ba416054bda7c5dab616b5e0d9b60e79b263bfc8156f13ebf6' 
  AND token = '9h3tyvQmvDps25u80Wo8fpOBWOzwJovvEvbu/aenVTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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