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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '889b3184b4eaacd113ff2807ae09e8bce3c2fdba9c2a6dec1876cad96446403d' 
  AND token = 'BU7whyIgnSXfFGe5ct5RixH3VJej2t/C2SO80D5lyAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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