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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8cfce98c4af3a65ca4dbeb16b1cfddf300e23415803daf00fee3798525f3c40' 
  AND token = '6gp9DJF+EKXz32S2HTC7bbLl+U8yeR9ffY0LQi+711g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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