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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '956955a2728a014449928f06b909d8a26f86893328e7d44ce7226a6feb4baed1' 
  AND token = 'qnAcrR7mI164cIxaLW1Jx4l+GCDHkHCONazk0Tk1ikI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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