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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14fa29de22eeb12e84186dc5c02a80b8554a2d262753c6c55100583479e3f5c2' 
  AND token = 'g9NTO+OSMK76uSJ4cO1OANvfRV2FXXrS042fluAnZ1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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