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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e84ace7428f97290cd3c082d58d8f61e31bcd8679bfb07dac99e14c9a39ad0b' 
  AND token = '17op2CVi+y2GIE2rpzg3GryTAF5DB/56CN3DBkvgyYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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