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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f23f4eed863349b1bfb6f18a1d482afb848921c357e471c45468c6fc6bc2db86' 
  AND token = 'YdmLq7AYgh31v3XGRgup78IpAH6yrSYu+HQYko4UTTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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