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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b91dd1fa149aa36c249f5083a033e1c0088ebcfd57f90b7ea2f8e230984a6558' 
  AND token = '2SRbzdx6YxSjGXBKZ8aC8KrEfxnkZ2XpEJUJ713HaC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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