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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e8c2a615d488acc41bf5c3a99f12386b1662b83baec9db9870cda36a06ed04c' 
  AND token = 'AVSCApxj0G0Df183a0h002SOQjvPRaV9IldMY+0PTd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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