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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dadc0b3812260d463411d0b468566b5e81408bb7743529aa9c9d9f68621492c4' 
  AND token = 'k7hkscykDdZlo6wp651yAzrEdv7y8731a2z0PLH72Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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