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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ae9923140c15a37ee8b8b2b4223ce54855bef9f608b14f2158e89b0dd7f124' 
  AND token = '9xQwOEVk00n56FTpkzR5gBVzuxbz2Li2h05Imuo4RJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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