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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f8573447d0fecc3882e84dc0277f8fba3b4fbcfdb15138b07784ac603799bdb' 
  AND token = '3XDNAkk+Db0mnKNeA2PJFdHKUP4Q2nz5uN31TXD7vT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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