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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13f33f9aab5ccf94a8bdd71d97e6dd0886d4da8750536a0707789a89757103e5' 
  AND token = 'pXSDRUK4WS388CjfcCAWdumYk4Lm0mrqwHr8a01XRc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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