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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15276e5c09debd5c00d21ca99e6d97ee3e8a60145eb5b37790fc0c077b5153e9' 
  AND token = 'fTgvWSb4r5wcXAfBlwJiTWmDBlgL03JkQW8wi6FphVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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