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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73c980fe16ce6d3472e4df6e76d9547fc176cdea793d5f5766c20ff1fe9c4e4b' 
  AND token = 'MAhbANrY2KyCmUfHeelJ5kHD8WSt5pQLdGzLf14XKQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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