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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0b6810b44068f4b2baaaa0c7dd4cee51dc1d2d33fe492d46d862f89bca785e9' 
  AND token = 'J5v27CefNVqvFHUvCCN3N7uENhN4GmhYcslyZ5Td++c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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