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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4041877a67aff70eef9557308fe86fbadeb47eb2939dd476ada2f76949702ddb' 
  AND token = 'u7uHu0AcxZ0tkuT28c4r1VOKfhf7ieuVUeU5aw2GHac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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