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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '882914182901edca59d4bbe873d548bb53e749dd4b8fd45ee3202645cfe80c14' 
  AND token = '4qHMmpaXFHi+6uydfyXPuhyUbPEXVDq9AspaPDL2qto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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