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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be57e5b24eebbbc33b4a1e811632b6520d3ff08c620de0419e1bfeca49770ae3' 
  AND token = 'U+K4bevSM+zD1cd3LTLzhS/Vg3awtja6Gk272FaQMF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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