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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9d21fd8fff5d91d2fe6f064944049b4fa927fd871f01a35767ddde25fc1c2a8' 
  AND token = 'iDahTbWcsoZKl/oO0juKYDolW+U9gxumQedkWvAzhpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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