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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe1f3f234a44c269d3cafbcd4e6ff14be5ca6f623af065b01753a7b59a76be9d' 
  AND token = 'oYfyEdEHFEkMGmSMEemvc9WAK4LLuMXpCoG2TX4E4hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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