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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4903944a804ab60e5ad9123c96072fb2ebdfbe47d7b3bf79715ad74ee05ddad' 
  AND token = 'lA9PC62O8gEwso7GFb2cxL/BpXk0Iqu90m0XrUn4TYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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