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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aabd8893a9e8fc83c59b090590ce5f975896384566b083d9127c909710297f8' 
  AND token = '3i+OiMXjohkU+5R0jGkktBalGNGAGS2lcbJSHBB4jmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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