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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a4aae40d4e3f769a30d00f81b1fee473be5de103e3ff2a41b4a38d5d04b0054' 
  AND token = 'ahjydi4cUaybg6bsZ1riv/igFHCPPS7Q7F7tHKdGJwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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