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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6db427695486b524ae446b26fd35edcbe26dc4a1d7a25d90c748ee8c9c455d68' 
  AND token = 'rmReSl5OosgOTDN3c/PBAvD11pdQflk3jrOlgTvRKpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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