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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df3882967a14bf22ae2fb088ad1aa9c8d77127872e90628ef8926d02e4050b88' 
  AND token = 'epQWQ75/A1COQZFbcmaWTBR6S/VlBVDdA/4PEDcozR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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