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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '091432ecdc80e0d435a29f5a5971d52f3debcb597658015dccd6d21467dcaa11' 
  AND token = 'AVSf0Y6BXBvcW10+2JNeAzrkXPrbGdoiwl90bp0cWt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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