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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac9c0a8f30906d8860ae6f584f713a57b52cf73eb6d08144a931a60507c191f9' 
  AND token = 'v8nXbPAQmobu672+8vk4yFGx/P0s8Vo4GW2/2MpAFV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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