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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07ec6c117dcb9f6ca23f2751a9a3cd125e4063353161eff78ed28c5f7d35dc77' 
  AND token = 'tZLB3oOSaN2D79XNe20Sazq6jilIwQl1LO96+1X1hEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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