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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a4d57cd98225101318bcaac7e2a93a92ec45e28f5454fd5846502cb11909097' 
  AND token = 'pLNb+pdK6aXSld2KURw48ToPHfiEJU2IvRMr2w4+fwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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